//
// Created by Jisam on 2024/7/21.
//
#include <bits/stdc++.h>
#define PSI pair<string,int>
#define PII pair<int,int>
#define VVI vector<vector<int>>
#define VI vector<int>
#define VS vector<string>

#define PQLI priority_queue<int, vector<int>, less<int>>
#define PQGI priority_queue<int, vector<int>, greater<int>>
#define i64 long long

using namespace std;

const int N = 1e5 + 5;
int ans;
void solve() {
    int n;
    cin >> n;
    string s;
    cin >> s;
    int zero = 0;
    int one = count(s.begin(),s.end(),'1');
    for(int i = 0; i < s.size(); i ++)
    {
        if(s[i] == '0' && (i == 0 || s[i - 1] =='1'))
        {
            zero ++;
        }
    }
    if(zero < one){
        cout << "Yes\n";
    }else{
        cout << "No\n";
    }

}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int T;cin >> T;while(T --)
        solve();
    return 0;
}